Dr. Mark Dean Snyder , MD
Anesthesiology โข Hannibal, MO
6000 Hospital Dr
Hannibal, MO 634016887
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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NPI assigned on August 26, 2005; this date does not establish years in practice.
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Published CMS data list 80 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- 00731 โ Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope: 14 service units.
- 00790 โ Anesthesia for other procedure on upper abdomen: 14 service units.
- 00811 โ Anesthesia for other procedure on large bowel using an endoscope: 14 service units.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPTยฎ only copyright 2023 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2024). CPT notice
See all 6 records in the table ยท Guide: How to read Medicare Part B data
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Published CMS data list 82 Medicare Part D prescriptions, including refills, in 2017.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2017. Published rows only; this is not a quality measure.
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Published Part D records, 2017:
- Hydromorphone Hcl โ 33 prescription fills, including refills.
- Methadone Hcl โ 15 prescription fills, including refills.
- Oxycontin (Oxycodone Hcl) โ 12 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2017. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 5 records in the table ยท Guide: How to read Medicare Part D prescriber data
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Close to the middle for Medicare Part B services among clinicians listed under Anesthesiology in Missouri (2024, 586 clinicians with data). Median for this group: 90. Middle half: 38 to 202.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 196 in 2020 to 80 in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2020โ2024.
Practice Location & Contact Primary Location
6000 Hospital Dr
Hannibal, MO 634016887
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
NPPES lists 2 distinct additional practice-address records in Putnam, CT; Saint Joseph, MO. See the list
Source: CMS NPPES NPI Registry, practice location records; release date unavailable.
CMS Doctors and Clinicians lists 4 distinct group names: Hannibal Regional Healthcare System Inc; Midwest Anesthesia Providers Sc; Missouri Hb Medical Services Llc and 1 more. See the list
Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File
University Of Kansas School Of Med (Kc/wich/sal)
1985
What Public CMS Data Show
Anesthesiology: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
148 people with Original Medicare in 2024
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider, 2024.
Medicare-allowed amount
About $13,917 in 2024
The total amount Medicare approved for these services in 2024. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
What this does not show: Medicare-allowed amount
This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024.
Paid by Medicare
About $11,049 in 2024
The part of the Medicare-allowed amount that Medicare itself paid in 2024, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
What this does not show: Paid by Medicare
This is not the clinician's income and not a measure of quality.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024.
30-day fills
85 standardized 30-day fills in 2017
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$18,287 in 2017
The total cost of these prescriptions in 2017, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2017.
Industry payments (Open Payments)
Fewer than 11 payment records totaling $23.76 in 2025
Drug and medical device companies must report certain payments to doctors and some other clinicians to CMS, such as meals, travel, speaking fees or research funding.
It shows reported financial ties between this clinician and companies. You can ask your clinician about them.
These records are submitted by drug and medical device companies, and a reported payment does not necessarily mean the financial relationship is improper.
General: payments not tied to research, such as meals, travel, consulting or speaking fees.
A reported payment does not necessarily mean the financial relationship is improper. Research payments can go to a hospital or university for a study the clinician leads, not to the clinician personally. Clinicians can dispute records with the company that reported them.
Source: CMS Open Payments, program year 2025.
Years since graduation
41 years (graduated 1985)
CMS Doctors and Clinicians data list 1985 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished school.
What this does not show: Years since graduation
It is not the number of years in practice, and more years does not mean better care.
Source: CMS Doctors and Clinicians National Downloadable File.
NPI first issued
2005
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Accepts Medicare assignment
CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, โDoes your provider accept Medicare as full payment?โ
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Dr. Snyder has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists Dr. Snyder as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Hannibal and Missouri
Billing and prescribing volume is not a quality rating.
Medicare Part B services
Close to the middle for clinicians listed under Anesthesiology in Missouri (2024, 586 clinicians with data). Median for this group: 90. Middle half: 38 to 202.
Too few clinicians listed under Anesthesiology in Hannibal have Medicare Part B data for 2024 to compare.
Medicare-allowed amount
A higher Medicare-allowed amount than 60% of clinicians listed under Anesthesiology in Missouri (2024, 586 clinicians with data). Median for this group: $8,727. Middle half: $3,241 to $20,137.
Too few clinicians listed under Anesthesiology in Hannibal have Medicare Part B data for 2024 to compare.
Paid by Medicare
A higher Medicare payment amount than 60% of clinicians listed under Anesthesiology in Missouri (2024, 586 clinicians with data). Median for this group: $7,055. Middle half: $2,595 to $15,881.
Too few clinicians listed under Anesthesiology in Hannibal have Medicare Part B data for 2024 to compare.
Medicare Part D
Comparisons use 2024 data. The latest CMS data for Dr. Snyder are from 2017.
8 active clinicians are listed under Anesthesiology with a practice address in Hannibal, MO (1,155 in Missouri).
Addresses are self-reported to NPPES and may be out of date.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part B services
Medicare Part B services decreased 59% from 196 in 2020 to 80 in 2024.
- 2020: 196
- 2021: 111
- 2022: 136
- 2023: 23
- 2024: 80
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Medicare-allowed amount
Medicare-allowed amount increased 33% from $10,475 in 2020 to $13,917 in 2024.
- 2020: $10,475
- 2021: $9,700
- 2022: $10,255
- 2023: $3,464
- 2024: $13,917
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Paid by Medicare
Paid by Medicare increased 32% from $8,373 in 2020 to $11,049 in 2024.
- 2020: $8,373
- 2021: $7,613
- 2022: $8,145
- 2023: $2,760
- 2024: $11,049
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Medicare Part D prescriptions
Medicare Part D prescriptions decreased 82% from 455 in 2013 to 82 in 2017.
- 2013: 455
- 2014: 83
- 2015: 364
- 2016: 143
- 2017: 82
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30-day fills
30-day fills decreased 82% from 469 in 2013 to 85 in 2017.
- 2013: 469
- 2014: 85
- 2015: 376
- 2016: 147
- 2017: 85
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Part D drug cost
Part D drug cost decreased 62% from $47,882 in 2013 to $18,287 in 2017.
- 2013: $47,882
- 2014: $3,552
- 2015: $36,184
- 2016: $42,232
- 2017: $18,287
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $97.25 in 2021 to $23.76 in 2025.
- 2021: $97.25
- 2022: $51.19
- 2023: $16.38
- 2024: $89.97
- 2025: $23.76
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2017), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo ยท Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2025 (payments made January 1 โ December 31, 2025): fewer than 11 records totaling $23.76.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Merck Sharp & Dohme LLC |
Food and Beverage
In-kind items and services
|
BRIDION | General | $23.76 |
Source: CMS Open Payments, program year 2025, released June 30, 2026.
Performed Procedures & Service Volume
CPTยฎ is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016โ2023 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners โ by Provider and Service data, 2017โ2024; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.
| HCPCS Code | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
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00731
Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope
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14 | 14 | $730.23 | $129.73 |
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00790
Anesthesia for other procedure on upper abdomen
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14 | 14 | $2069.53 | $303.41 |
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00811
Anesthesia for other procedure on large bowel using an endoscope
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14 | 14 | $1277.28 | $116.39 |
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64447
Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve)
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14 | 14 | $419.21 | $60.30 |
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00142
Anesthesia for lens surgery
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12 | 12 | $801.85 | $75.82 |
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01402
Anesthesia for procedure for total knee joint replacement
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12 | 12 | $1639.10 | $372.50 |
Source: CMS Part B by Provider and Service, 2024; services under 11 beneficiaries omitted by CMS. Privacy limits
Submitted charges are billed amounts, not a price quote for your visit.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2017.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Hydromorphone Hcl | Hydromorphone Hcl | 33 | 979 | $1,726.38 | โ |
| Methadone Hcl | Methadone Hcl | 15 | 450 | $153.00 | โ |
| Oxycontin | Oxycodone Hcl | 12 | 365 | $14,799.65 | โ |
| Oxycodone-Acetaminophen | Oxycodone Hcl/Acetaminophen | 11 | 330 | $879.04 | โ |
| Voltaren | Diclofenac Sodium | 11 | 267 | $728.90 | โ |
Source: CMS Part D by Provider and Drug, 2017; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2026-06-26NUCC Taxonomy Code: 207L00000X
An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.
NUCC Taxonomy Code: 207L00000X
An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.
NUCC Taxonomy Code: 207L00000X
An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.
NUCC Taxonomy Code: 207L00000X
An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.
NUCC Taxonomy Code: 207LP2900X
An anesthesiologist who provides a high level of care, either as a primary physician or consultant, for patients experiencing problems with acute, chronic and/or cancer pain in both hospital and ambulatory settings. Patient care needs are also coordinated with other specialists.
Additional State Medicaid & Healthcare Payer Identifiers
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - ANESTHESIOLOGY
I20201012002621
CT
1355417395
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Medicare Group Practice Enrollments
Source: CMS Doctors and Clinicians National Downloadable File
Hannibal Regional Healthcare System Inc
Po Box, Hannibal, MO 634011257
Phone: 5732485460
Midwest Anesthesia Providers Sc
1101 W Liberty St, Farmington, MO 636401921
Phone: 5737566451
Missouri Hb Medical Services Llc
3100 Oak Grove Rd, Poplar Bluff, MO 639011573
Phone: 5737769290
North American Partners In Anesthesia Connecticut Pc
320 Pomfret St, Putnam, CT 062601836
Phone: 8609286541
Missouri Hb Medical Services Llc
315 S Osteopathy Ave, Kirksville, MO 635016401
Phone: 6607851000
Secondary Practice Locations
320 Pomfret St
Putnam, CT 062601836
Phone: 8609286541
5325 Faraon St
Saint Joseph, MO 645063488
Phone: 8162716350
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Nurse Anesthetist, Certified Registered
DNAP, Certified Registered Nurse Anesthetist
Nurse Anesthetist, Certified Registered
DNAP, Certified Registered Nurse Anesthetist
Anesthesiology
Doctor of Osteopathic Medicine (D.O.)
Anesthesiology
Doctor of Medicine (M.D.)
Nurse Anesthetist, Certified Registered
Certified Registered Nurse Anesthetist
Nurse Practitioner - Adult Health
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Anesthesiology (license number reported to NPPES: KS 04-22743)
Registered at 6000 HOSPITAL DR, HANNIBAL, MO 634016887 (Tel: 5732485115)
Registered at 120 TERRACE LN, HANNIBAL, MO 634012768
Registered at 2845 GREENBRIER RD, GREEN BAY, WI 543116519 (Tel: 8772290273)
Registered at 1035 KEPLER DR, GREEN BAY, WI 543118320 (Tel: 9204909046)
Anesthesiology (license number reported to NPPES: CT 66415)
Anesthesiology (license number reported to NPPES: KS 04-22743)
NPI status registered as active in NPPES database
Registered at 6000 HOSPITAL DR, HANNIBAL, MO 634016887 (Tel: 5732485115)
Registered at PO BOX 551, 6000 HOSPITAL DRIVE, HANNIBAL, MO 634010551 (Tel: 5732485115)
Recorded as MARK SNYDER, M.D.
Anesthesiology (license number reported to NPPES: MO 2006001821)
NPI status registered as active in NPPES database
Registered at 520 S SANTA FE AVE, SUITE 260, SALINA, KS 674014190 (Tel: 7858272238)
Registered at PO BOX 1607, SALINA, KS 674021607 (Tel: 7858272238)
Recorded as MARK SNYDER, M.D.
Anesthesiology (license number reported to NPPES: KS 04-22743)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Anesthesiology Specialists in Hannibal
- Dr. Megan Kramer, DO
- Dr. Jason Howard, DO
- Dr. Tria Wilhite, MD
- Dr. Andrew Hummel, MD
- Dr. Eric Ruocco, MD
Mailing Address
120 Terrace Ln
Hannibal, MO 634012768